Please note that they have released two different firmwares that output v2.0.0.0 on the console.
One of the 2.0.0.0 version has a bug and can only send confirmed messages which will quickly violate the TTN fair use policy
For the other 2.0.0.0 version, I am not sure if by default the node is sending unconfirmed messages or if you need to manually change the parameter